/Engine/Plugins/Animation/IKRig/Source/IKRigEditor/Public/RetargetEditor/IKRetargetHitProxies.h
Allow bone selection to edit retarget pose
struct HIKRetargetEditorBoneProxy : public [HHitProxy](API\Runtime\Engine\HHitProxy)
int32
BoneIndex
FName
BoneName
ERetargetSource...
SourceOrTarget